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Magnetic and Gravity Toolface and How ToInterpret The Meaning For Directional Drillingby DrillingFormulas.Com on November 22, 2014
Magnetic and gravity tooสface are terms in directional drilling world to describe the direction of the well.They are different in meaning and application therefore this article will teach you about theseterminologies and how to read it.
Magnetic ToolfaceThe magnetic toolface is an angle projection onto the horizontal plane between the tool face and magneticnorth. Typically, directional tools use the magnetic tool face when the inclination is less than 5 degree. TheFigure 1 demonstrates that the mud motor is lined up to kick off at 30 degree azimuth magnetic.
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Figure 1 – Magnetic Toolface
Gravity ToolfaceThe gravity toolface or high-side toolface is used for a section of the well which has an inclination morethan 5 degree. The high-side is the top of the hole perpendicular to the wellbore axis and the low side isthe bottom of the hole (Figure 2). The tool is measure in relative to high-side tool face.
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Figure 2 - Gravity Toolface (High Side Toolface)
What Does Toolface Tell You About Directional Drilling?
Toolface at 0 degree – it means that a mud motor is lined up to build angle only but there is no change inazimuth.
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Figure 3 - Toolface at 0 Degree
Toolface at 180 degree - it means that a mud motor is lined up to drop angle only but there is no changein azimuth.
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Figure 4 - Toolface at 180 Degree
Toolface at 90 degree – it means that a mud motor is lined up to turn the right only but there is no changein inclination.
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Figure 5 – Toolface at 90 degree
Toolface at 270 degree – it means that a mud motor is lined up to turn the left only but there is no changein inclination.
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Figure 6 – Toolface at 270 degree
Toolface at 45 degree - it means that a mud motor is lined up to turn the right and build angle.
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Figure 7 - Toolface at 45 degree
Toolface at 135 degree - it means that a mud motor is lined up to turn the right and drop angle.
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Figure 8 - Toolface at 135 degree
Toolface at 225 degree - it means that a mud motor is lined up to turn the left and drop angle.
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Figure 9 – Toolface at 225 degree
Toolface at 315 degree - it means that a mud motor is lined up to turn the left and build angle.
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Figure 10 – Toolface at 315 degree
Summary – The illustration below shows the meaning of the toolface on each location.
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Figure 11 – Toolface Diagram Summary
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What are Magnetic Toolface and Gravity Toolface?Angle Averaging Method in Directional Drilling CalculationDirectional Drilling Handout from Texas AM
Tagged as: directional drilling, grativty toolface, magnetic toolface
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jose mendez November 26, 2014 at 9:27 pm
Magnetic tool
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jose mendez November 26, 2014 at 9:37 pm
Macnetic toolface
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Arekumo ThankGod December 29, 2014 at 8:05 pm
Nice site. I need your articles from time to time.
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Enyindah Joseph March 6, 2015 at 1:20 am
It nice and educative
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